ADSA Indianapolis 2001 (1) 2001 A Global Scale for Ranking Dairy Bulls Using Blended National Rankings Rex L. Powell * Paul M. VanRaden Animal Improvement.

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Presentation transcript:

ADSA Indianapolis 2001 (1) 2001 A Global Scale for Ranking Dairy Bulls Using Blended National Rankings Rex L. Powell * Paul M. VanRaden Animal Improvement Programs Laboratory Agricultural Research Service, USDA, Beltsville, MD

ADSA Indianapolis 2001 (2)R. L. Powell 2001 R. L. Powell 2001 Multiple Rankings for Bulls Multiple Rankings for Bulls Holstein International 2001

ADSA Indianapolis 2001 (3)R. L. Powell 2001 R. L. Powell 2001 Objective Examine procedures for combining Interbull country evaluations into a common global evaluation Develop base knowledge for next step (sub-global)

ADSA Indianapolis 2001 (4)R. L. Powell 2001 R. L. Powell 2001 Data  May 2001 Interbull evaluations  27 Holstein population scales  65,472 bulls with protein data  24 million daughters

ADSA Indianapolis 2001 (5)R. L. Powell 2001 R. L. Powell 2001 Numbers of Daughters by Country and Proportion of Global Total CountryDaughtersProportion United States 4,148, Germany 3,635, France 2,940, New Zealand2,523, Netherlands2,213, Canada1,122, Great Britain1,113, Australia1,083, Others5,025, Total23,806,

ADSA Indianapolis 2001 (6)R. L. Powell 2001 R. L. Powell 2001 Methods  Evaluations standardized (x-mn)/sd  Global as bull mean, weighted by  Population size  Unweighted  Inverse of population size  Impact on top 100 determined

ADSA Indianapolis 2001 (7)R. L. Powell 2001 R. L. Powell 2001 Relation of National & Global Scale Within Birth Year CountryCorr(N,G) Common top 100 Mean r g SD r g Australia Canada France Germany Netherlands New Zealand United States Corr(N,G) = correlation of national with global scale r g = correlation of national scale with other national scales

ADSA Indianapolis 2001 (8)R. L. Powell 2001 R. L. Powell 2001 Population Size Unweighted Inverse Weighting Population Size Unweighted Inverse Weighting 9597 Relationships of Global Scales Correlations & Common Top 100

ADSA Indianapolis 2001 (9)R. L. Powell 2001 R. L. Powell 2001 Conclusions  Global evaluations highly correlated with national evaluations  Variation between national and global top 100 lists related to mean genetic correlation  Global evaluations robust to weighting procedures (r ~ 1.0)